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Information × Registration Number 0224U002697, 0123U102288 , R & D reports Title Radiophysical effects in nanoelectronic systems with graphene elements, unconventional superconductors and magnetised semiconductors popup.stage_title Head Nosych Oleksandr Yo., д.ф.-м.н. Registration Date 25-02-2024 Organization O. Ya. Usikov Institute for Radiophysics and Electronics NAS of Ukraine popup.description2  The linear theory of instability of a magnetised tubular electron beam blowing a cylindrical plasma-solid-state waveguide with high conductivity and located in a coaxial magnetic field is further developed. The manifestation of the Aaronov-Bohm effect in the hydrodynamic instability of a tubular non-relativistic electron beam moving along a dielectrically filled semiconductor nanotube placed in a coaxial permanent magnetic field is investigated theoretically. The numerical analysis shows that due to this effect, the time of instability saturation and the maximum field amplitudes depend on the number of magnetic flux quanta in the nanotube and vary with a period equal to one magnetic flux quantum. Numerical analysis and measurements of the dissipative properties of superconducting micro-ribbon disc resonators excited at different magnetic fields are carried out. It is shown that the radiation losses of the whispering gallery modes are very small, which makes the resonator shielding unnecessary. In addition, in the millimetre wavelength range, the size of the resonator on the fundamental mode becomes unacceptably small, so it is more practical to use the whispering gallery modes. Computer programs for the numerical solution of the problems of scattering and diffraction of waves by micro- and nano-sized metastructures with resonant graphene elements have been developed and verified. The resonant scattering and absorption of E-polarised terahertz waves on a graphene ribbon grating on a substrate are analysed in detail. The power losses of a modulated electron beam for emission and absorption in the presence of a pair of circular dielectric nanoribbons coated with graphene near the beam path are studied. Product Description popup.authors Averkov Yurii O. Apostolov Stanislav S. Balaban Mykhaylo V. Oleksandr A. Barannyk Hubin Oleksii I. Serhii V. Dukhopelnykov Kadyhrob Dmytro V. Lavrynovych Oleksandr A. Zakhar O. Maizelis Melnyk Serhii I. Natarov Denys M. Prokopenko Yurii V. Protsenko Iryna O. Rokhmanova Tetiana M Cherpak Mykola T. Yampolskyi Valerii O. popup.nrat_date 2024-02-25 Close